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SR-239 is a legislatively approved, but unconstructed route in the California state highway system. The purpose of this study is to determine the ultimate concept and alignment for the route in the context of the regional transportation network that includes part of three counties: Contra Costa, San Joaquin and Alameda. This route has the potential to provide improved regional connectivity, job realization, congestion relief, and roadway safety & emergency access. Contra Costa County was awarded $14 million for initial study and planning under SAFETEA-LU in 2005. Administration of the study, now called TriLink, was transferred to the Contra Costa Transportation Authority (CCTA) in January 2012.